no - never stated your values for Enthalpy were wrong - I do not think you ever posted any enthalpies - please check my posts.
if basing a calc on data other than what you have observed and collected - suggest 1) identify source, 2) provide link (3) complete units and where there could be different ways to calc or define outputs of the calc, maybe definitions - example, net efficiency - should identify the boundaries of the system/cycle that you are calc (power output divided by fuel input = effcy - if net then, usually would subtract any driven loads along with any power supplied by outside sources - Harry's air compressor, ...)
from 50,000 feet effcy you need to say whther the calc is net where is based on lower heating value of fuel which is typical for engine guys (and miss-states the effcy cause is based not on the way users buy fuel)
other board is SYMX
looking forward to sources for the data that you are basing on (still strongly suggest pick your fuel) and, this data is again remarkably different from previous
and always suggest putting the calc down in the post
